CN86201209U - Digital measuring instrument for coil turns - Google Patents
Digital measuring instrument for coil turns Download PDFInfo
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- CN86201209U CN86201209U CN 86201209 CN86201209U CN86201209U CN 86201209 U CN86201209 U CN 86201209U CN 86201209 CN86201209 CN 86201209 CN 86201209 U CN86201209 U CN 86201209U CN 86201209 U CN86201209 U CN 86201209U
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- coil
- measurement mechanism
- test
- converter
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Abstract
The utility model adopts a closed magnetic return path and a double coil to excite the test loop of a magnetic field, uses the commercial power as an excitation source, and uses a single chip large scale integrated circuit to directly realize the functions of proportion calculation, A/D conversion, digital display, etc. The utility model is a digital testing device for the number of coil turns and coil short circuit, with high measurement precision, large measurement range and strong adaptability.
Description
The invention belongs to the measuring apparatus of electric weight.
Existing coil turn measurement mechanism generally can be divided into two classes, and a class is " a magnetic pressure relative method ", comprises " magnetic pressure---phase-comparison method "; Another kind of is " Faradic electricity magnetic induction principle ", and the induced voltage that produces according to tested winding records its number of turn.Back one class is adopted non-closed magnetic circuit transformer method usually, unicoil excitation field, the excitation source fixed ampllitude oscillation source that adds.Its shortcoming is that measurement range is little, and measuring error is big, needs complicated correction-compensation measure and circuit, generally only is adapted to internal coil diameter greater than 5mm, less than the normal coil of 100mm, and for small-bore, heavy caliber, the coil that thickness is big and special-shaped, bad adaptability.
The purpose of this invention is to provide a kind of measuring accuracy height, measurement range is big, and adaptability is strong, can measure the number of turn of coil that internal diameter is not less than the different shape of 1mm, detectable coil inside short circuit simultaneously, circuit simple numerical formula coil turn measurement mechanism.
The present invention partly is made up of test loop, attenuator, AC/DC converter, wave filter, double integration A/D converter, display and compensating circuit etc.In the test loop by a closed magnetic loop of forming by the soft magnetic material of high permeability as test frame, be with three coils on it: field coil Tm, reference coil Tr and by test coil Tx.Civil power u～by Tm whole closed magnetic loop is carried out excitation as excitation source, at this moment on Tr and Tx, produce induced voltage ur and ux respectively, according to the law of electromagnetic induction, the induction electromotive force of two coils and their number of turn are proportional in a closed magnetic loop, can push away to such an extent that the number of turn Nx of Tx is thus:
Nx＝ (ux)/(ur) ·Nr
Wherein Nr is the number of turn of reference coil Tr.
Ux and ur by two-way high-precision A C/DC converter, are transformed into DC voltage Ux and Ur respectively, deliver to double integration A/D converter, as its input voltage and reference voltage.In double integration A/D converter, be actually a Ux and Ur and compare (being divided by), the ratio that its output is Ux and Ur is multiplied by a coefficient (1000) again.If Nr is set at a certain fixed value, then can directly read by the number of turn of test coil from display.
Obviously, before ux is input to the AC/DC converter, add an attenuator, can enlarge measurement range.
During the detecting coil short circuit, the upper cross bar of above-mentioned test frame is raised, become the U-iron core, its sheer pole is wound with field coil T ' m and reference coil T ' r, and other has two input sample coil T ' x
1, T ' x
2, the T ' x on the montant of U-iron core two ends
1, T ' x
2By oppositely being connected in series, after cancelling each other, the voltage of its output delivers to the u ' x end that the number of turn is measured.As T ' x
2Surveyed on the iron core of one side by test coil short circuit phenomenon is arranged the time, T ' x
1, T ' x
2The two output voltage out of trim, differential output voltage u ' x rises.Short circuit is serious more, and u ' x rises obvious more, then can obviously see reading on display and obviously rise.
Field coil can adopt unicoil, also can adopt twin coil.When adopting the twin coil excitation mode, field coil is divided into Tm
1With Tm
2, adjust Tm
1With Tm
2Position on test frame, can make leakage flux that their produce in the test section (being the reference test bar middle part) cancel each other, guarantee that the test section forms magnetic field uniformly.Compared with unicoil excitation better effects if.
By embodiment that accompanying drawing provided will the present invention is further illustrated.
Fig. 1 (a) and (b) are coil turn measurement mechanism electrical schematic diagram.
In Fig. 1 (a), test frame is made the rectangle iron core closed magnetic loop, adopts the soft magnetic material of high permeability, so that improve the relative ratio of main flux and leakage flux.Field coil Tm, T ' m are housed, reference coil Tr, T ' r and input sample coil T ' x on the test frame
1, T ' x
2Wherein Tm, Tr are as test coil number of turn usefulness, T ' m, T ' r and T ' x
1, T ' x
2Whether use during short circuit as detecting coil.The upper cross bar of test frame (2) can be raised up, so that will be inserted in reference test bar (1) by test coil Tx.By the output of test coil Tx via W
1, W
2, W
3, W
4And R
1, R
2, R
3, R
4The attenuator of forming is delivered to one road AC/DC converter, and " ÷ 4 " button is used to expand four times of readings, to reduce the influence of quantization error, the attenuator attenuation multiple is reduced by four times can realize this purpose." S " key is the switch key of detecting coil short circuit.U～key is that civil power is imported as excitation source, generally uses after step-down, preferably reduces to safe voltage, for example about 36V.Another road AC/DC converter is delivered in the output of reference coil Tr.M is the test frame fixed head.
In Fig. 1 (b), two-way AC/DC converter, active low-pass filter, the correction of heavy caliber coil and degree of stability compensating circuit are by a four high guaily unit integrated circuit (IC)
1 Finish pin 1,2,3; 5,6,7; 8,9,10 and 12,13,14 respectively form an operation amplifier circuit.R
15, R
16, R
17, W
5Form heavy caliber coil correction circuit with the waver that is attached thereto, when " 0 " number key is pressed, by IC
1Its output voltage of operational amplifier u of forming of pin 5,6,7.For:
u
0＝－ (R
12+W
5+R
15+R
16+R
17)/(R
4+R
11) ui
Wherein ui is R
9Input terminal voltage.When " 4 " number key is pressed, u
0For:
u
0＝－ (R
12+W
5+R
15+R
16)/(R
9+R
11) ui
Press each key one by one, u
0To progressively descend.
As " W " when key is pressed, C
7With C
8Parallel connection increases the active power filtering time constant of ui one tunnel, and degree of stability is improved.
IC
1Pin 4(Pin4) with pin 11(Pin11) be connected with-12V power supply with+12V respectively.IC
1Can select four high guaily unit integrated circuit such as LM324 for use.
IC
2Be the extensive double integrator integrated circuit of monolithic, functions such as completed percentage computing simultaneously, A/D conversion and numeral demonstration, circuit is simple, need not adjust zero point.IC
2Can select ICL7107 for use.
Strong adaptability of the present invention, measurement category is big, internal coil diameter can be little to 1mm, the miniature coils of clock coil and so on for example arrives greatly the big molded lines bag of power transformer. Coil shape is any, especially aspect the various special-shaped coils of measurement, outstanding superiority is arranged, the certainty of measurement height, and the certainty of measurement of the number of turn is better than 3/1000ths. Can be on same test frame the whether short circuit of search coil inside, as long as short circuit one circle namely has obvious indication. Because utilize the civil power step-down directly as excitation source, adopt the twin coil excitation mode, use the functions such as the direct completed percentage computing of Monolithic LSI circuit, A/D conversion and numeral demonstration, circuit is simple, reliable, need not adjust zero point.
Claims (7)
1, a kind of digital coil turn measurement mechanism, form by test loop, AC/DC converter, A/D converter, display and excitation source, it is characterized in that test frame adopts closed magnetic loop, has field coil on closed magnetic loop, reference coil adopts the civil power excitation field as excitation source.
2, measurement mechanism according to claim 1 is characterized in that the field coil of test loop can preferably adopt twin coil with unicoil or twin coil.
3, measurement mechanism according to claim 1 is characterized in that scale operation, A/D converter and numeral show employing monolithic double integrator integrated circuit.
4, measurement mechanism according to claim 1 is characterized in that using as the general step-down of civil power of excitation source, preferably is depressurized to about 36V.
5, measurement mechanism according to claim 1 is characterized in that two-way AC/DC converter, active power filtering, heavy caliber coil and degree of stability compensating circuit adopt a four high guaily unit integrated circuit.
6,, it is characterized in that the reference test bar district of placing by test coil do not place other winding according to claim 1 and 2 described measurement mechanisms.
7, measurement mechanism according to claim 1 is characterized in that being provided with ÷ 4 Range Extension keys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201209 CN86201209U (en) | 1986-03-08 | 1986-03-08 | Digital measuring instrument for coil turns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201209 CN86201209U (en) | 1986-03-08 | 1986-03-08 | Digital measuring instrument for coil turns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86201209U true CN86201209U (en) | 1987-03-18 |
Family
ID=4805017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86201209 Withdrawn CN86201209U (en) | 1986-03-08 | 1986-03-08 | Digital measuring instrument for coil turns |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86201209U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887083B (en) * | 2009-05-13 | 2012-07-18 | 精进电动科技（北京）有限公司 | Turn number test device and method |
| CN103630766A (en) * | 2012-08-21 | 2014-03-12 | 上海海碧电子科技有限公司 | Winding measuring instrument |
-
1986
- 1986-03-08 CN CN 86201209 patent/CN86201209U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887083B (en) * | 2009-05-13 | 2012-07-18 | 精进电动科技（北京）有限公司 | Turn number test device and method |
| CN103630766A (en) * | 2012-08-21 | 2014-03-12 | 上海海碧电子科技有限公司 | Winding measuring instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |